Cardiovascular - Structure, Muscle Tissue, Coverings, Location

Question 1

Where is the heart in the human body?

Answer 1

Between lungs (slightly left)

Question 2

Size of the heart? Weight?

Answer 2

Less than a pound and about the size of a fist

Question 3

What is the pericardial sac?

Answer 3

Surrounds heart

Question 4

What is the pericardial cavity?

Answer 4

• contains serous fluid
• Bounded by two serous membrane

Visceral pericardium aka epicardium (attached to heart)

Parietal pericardium (forming outer wall of cavity)

Question 5

What type of muscle tissue only found in heart?

Answer 5

Cardiac muscle tissue

Question 6

Where does cardiac muscle cells get blood supply from?

Answer 6

Capillaries instead of ventricles

Question 7

Why does cardiac muscle cells have a lot of mitochondria?

Answer 7

Because the heart needs a lot of ATP to work

Question 8

What are the three layers of the heart?

Answer 8

1. Epicardium
2. Myocardium
3. Endocardium

Question 9

Where is myocardium found? What is it composed of?

Answer 9

Between epicardium and endocardium

Composed of concentric layers of cardiac muscle tissue and blood vessels and nerves